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Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2021
Jun. 28, 2020
Jul. 04, 2021
Jun. 28, 2020
Net Income Loss Per Common Share        
Net income for basic and diluted net income per share $ 328,319 $ 188,908 $ 533,831 $ 365,098
Weighted average common shares-basic 165,995 165,789 166,243 166,189
Incremental shares from assumed conversion of convertible notes [1] 9,578 7,599 9,944 7,466
Convertible note hedge warrant shares [2] 10,073 5,824 9,751 5,658
Employee stock purchase plan 11 0 9 13
Dilutive potential common shares 20,755 14,468 21,002 14,308
Weighted average common shares-diluted 186,750 180,257 187,245 180,497
Net income per common share-basic $ 1.98 $ 1.14 $ 3.21 $ 2.20
Net income per common share-diluted $ 1.76 $ 1.05 $ 2.85 $ 2.02
Restricted Stock Units        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 1,015 913 1,205 1,038
Stock Options        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 78 132 93 133
[1] Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.54, multiplied by 12.7 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
[2] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.58, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.